1. Department of Formulation Design and Pharmaceutical Technology, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
2. Department of Biophysical Chemistry, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
3. Toyo Sugar Refining Co., Ltd., 18-20 Koami-Cho, Nihonbashi, Chuo-ku, Tokyo 103-0016, Japan